Finding the Fourth Proportional to 139.89, 209.83 and 48.62

Step by Step Solution

1. Step 1: Write the proportion equation
   139.89 : 209.83 = 48.62 : x
2. Step 2: Convert to fraction form
   139.89/209.83 = 48.62/x
3. Step 3: Cross multiply
   139.89x = 209.83 × 48.62
4. Step 4: Simplify right side
   139.89x = 10,200.89
5. Step 5: Solve for x
   x = 10,200.89/139.89
6. Step 6: Final answer
   x = 72.92